Yeah I went through this not too long ago. I had a site on Joomla 4 running Helix Ultimate with a bunch of overrides, custom SCSS, and a couple JavaScript bits thrown in.
Thought the upgrade to 5 would be simple... it wasn’t lol.
Some of the template overrides held up fine, but stuff like the header and module positions got all messed up. I had to manually adjust a few things in the layout and double check the templateDetails file. Might’ve been my own messy code, not sure.
Also Helix didn't behave exactly the same after the upgrade. I was still on like version 2.0.11 or something, and Joomla 5 didn’t like it at all. Updating Helix first helped a lot, but I still had to redo some of the template settings - stuff like logo position and the offcanvas menu just reset on me for no reason.
One weird issue I hit - the JS I used for a sticky header stopped working completely. I had to rewrite it using vanilla JS cause the way scripts load seems a bit stricter now in Joomla 5.
I mean if you’re using a ton of customization, I’d definitely test on a staging site first. I wouldn’t start from scratch unless your template is totally outdated. Upgrading’s doable, just expect to do some cleanup.
What Helix version are you running anyway? Maybe I ran into the same stuff.
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